Line Rider
Line rider is a game about physics, and riding some lines. Now you don't control the little guy with a sled, but you can make him do pretty much about anything you want him to do. You can make him do jump, loop da loops, go backwards and forwards.
Its just a neat little game, nothing more nothing less.. You'll spend an hour or two and then move on. Line Rider is a browser based game so there is no need to install or uninstall when your finished. Just like mine craft, Line rider spawned many variations, one alternative is a game where you draw the lines and ride your motorcycle though the course you made.